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Old 06-16-2021, 01:40 PM   #1
Mini-Skoolie
 
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Join Date: Mar 2019
Location: Troy, VT
Posts: 16
Year: 1999
Coachwork: Amtran
Chassis: International 3800
Engine: DT 466 Int.
Rated Cap: Depends on gender
99 International Dt466e overheating

Hey all, I'm hoping for some direction.

My 99 11 window front engine Amtran with AT 545 has about 300 miles on an engine rebuild from a knowledgeable and reputable mechanic. At the time, he replaced the radiator and thermostat as well. Also, the brakes were serviced.

My problem...I can't climb a long hill (over 1 mile) without the engine overheating and alarming. ELC coolant level is good.

I hate to bring it back again but realize I may have to, but any ideas as to why overheat? I'm barely crawling!

Thanks 😊

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Old 06-16-2021, 02:44 PM   #2
Bus Nut
 
Join Date: May 2015
Location: Miami, Fl.
Posts: 561
Year: 1999
Chassis: Amtran / International
Engine: DT466E-Md3060
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Originally Posted by Compass View Post
Hey all, I'm hoping for some direction.

My 99 11 window front engine Amtran with AT 545 has about 300 miles on an engine rebuild from a knowledgeable and reputable mechanic. At the time, he replaced the radiator and thermostat as well. Also, the brakes were serviced.

My problem...I can't climb a long hill (over 1 mile) without the engine overheating and alarming. ELC coolant level is good.

I hate to bring it back again but realize I may have to, but any ideas as to why overheat? I'm barely crawling!

Thanks ��
First thing I would look at is the radiator itself, are the fins clogged/dirty? Is air getting thru?

You can get some quality cleaner at an A/c supply house, a place that serves a/c techs, not the retail public. They have great cleaners for cleaning the a/c condenser coils.



They also sell fins combs, for straightening out the fins when the get smashed closed.



Then I would look at, what type of fan you have. Is it working properly?

that is where I would start, easy and cheap to do.
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Old 06-16-2021, 03:42 PM   #3
Bus Nut
 
Join Date: Oct 2020
Location: Near Flagstaff AZ
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If you've got a fresh rebuild engine and a new radiator, I would definitely be looking at your fan and fan clutch. When it gets hot, can you pull over and pop the hood and make sure the fan is turning aggressively? It will turn some, even if the fan clutch isn't locked, just because of the friction. But it should sound like a turbine and moving a ton of air when it's hot. If your fan clutch is not locking the fan, then that would definitely be a problem when climbing hills.
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Old 06-18-2021, 04:00 PM   #4
Bus Nut
 
Join Date: Sep 2017
Location: Cerrillos, NM
Posts: 297
Year: 2002
Coachwork: Amtran
Chassis: Front Engine
Engine: DT466E
Rated Cap: 72
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Originally Posted by rossvtaylor View Post
If you've got a fresh rebuild engine and a new radiator, I would definitely be looking at your fan and fan clutch. When it gets hot, can you pull over and pop the hood and make sure the fan is turning aggressively? It will turn some, even if the fan clutch isn't locked, just because of the friction. But it should sound like a turbine and moving a ton of air when it's hot. If your fan clutch is not locking the fan, then that would definitely be a problem when climbing hills.

I had this same experience and it was my fan clutch. When going up a hill at some point the engine sound should change very significantly, especially if itís a flat nose front engine, and youíll absolutely know when the fan kicks on. Not sure about a dognose but if itís an FE and youíre not hearing the fan when itís hot itís very likely the clutch. Fwiw my bus also will engage the fan when I first start it for a moment, and itís kind of a comfort feeling for me when I hear it but I donít know if they all do.
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Old 06-18-2021, 04:31 PM   #5
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 15,197
Year: 1991
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Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
its normal for the fan to run full bore for a minute or 2 when first starting out.. my DEV bus does it and even on a dognose bus i hear that fan spinning even over the sound of the DT engine..
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Old 06-18-2021, 10:46 PM   #6
Skoolie
 
Join Date: Oct 2018
Location: Central Alabama
Posts: 220
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
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Quote:
Originally Posted by Compass View Post
My 99 11 window front engine Amtran with AT 545 has about 300 miles on an engine rebuild from a knowledgeable and reputable mechanic. At the time, he replaced the radiator and thermostat as well. Also, the brakes were serviced.

My problem...I can't climb a long hill (over 1 mile) without the engine overheating and alarming. ELC coolant level is good.

I hate to bring it back again but realize I may have to, but any ideas as to why overheat?
I suspect the fan clutch as well. You can get an idea by turning the fan by hand (engine off of course) and you should feel resistance. If it spins freely then the clutch needs to be replaced.

Other things would be inadequate bleeding of air in the coolant system, bad water pump or the thermostat is bad even though it's new.

But if this started from day one after engine work, then absolutely take it back. Way too much money to burn up an engine, unless it was free.
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